Need advice on admin area

Dear everyone,
As a starting ICT coach at my primary school, I started a project where I make lessons with articulate. I upload these lessons via the elearningfreak plugin on a wordpress site and let students log in with their Google account from school. This is going well and my colleagues are enthusiastic. The next step is to create an admin area where teachers can set up lessons and view results. Since it is a school project for our school only, the costs should not be too high. Who has the best tip for me to tackle this?

Thanks in advance!